A communications system comprising a communications device which is integrated in a motor vehicle and has an input unit and an audio output unit which are connected to a control unit, and a mobile radio module, connected to the control unit, of a cellular mobile radio system, and a short-range radio device which is connected to the control unit, and an external mobile radio device of a cellular mobile ratio system with a second short-range radio device, the short-range radio devices being configured to exchange data over a short-range radio link, the communications device comprising a comparator module for comparing data received from the mobile radio device over the short-range radio link with data stored in a storage element of the communication device, and it being possible to automatically set up a mobile radio link for transferring a status message within the mobile radio system when received and stored data correspond in terms of predefined features.